Fitting a rev-counter to an XR125

[Shoka]

As the subject says. Hypothetically, would this be possible? Does the engine have any kind of connection for a mechanical rev-counter, or is there a way of clipping to some leads somewhere a rev counter? I know you can get ones that just pick up signals from the ignition leads.

This was just a pretty random idea, I wondered whether it'd be possible.

[sickpup]

Yes it would be possible but you need to know the maximum revs of the bike to know which rev counter to buy.

[Shoka]

I suppose you'd be able to find that out by taking a recording of the engine sound at full throttle, analysing it with an audio program to determine the frequency, then multiplying it by two to compensate for the fact that one of the rotations per cycle isn't accompanied by a combustion.

Seems complex perhaps, but as far as I know, Honda don't list the actual max RPM, just the max power/rpm and max torque/rpm.

But in case I misunderstood it, the max power rating is at 8,500RPM.

Logically, you'd think you'd get the most power when the engine is revving the fastest, but I don't know for sure. If you do, then I guess that's the value, 8,500RPM.

[Philious]

I wondered about this when i got mine, I gave up looking in the end.

I can judge it by ear now anyway
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Previously; Honda XR125 - Yamaha DT125r - Aprilia Rs125 - Suzuki GS500e, Currently; Kawasaki ZX6R + ZX10R
Theory : Passed 28/7/09 Module 1: Passed 21/09/09 Module 2: Passed 23/09/09